Rotating brush for surface treatment of working pieces

ABSTRACT

Disclosed is a rotating brush for surface treatment of working pieces. The rotating brush includes a brush fitting clamped between two clamping disks. The brush is so designed that the two clamping disks present on their opposing sides an axial shoulder of such inside and outside diameters that, when the disks are secured to each other, the axial shoulders of the one engages into that of the other to form an assembly, thereby forming a cylindrical holding element in which the brush fitting is inserted.

FIELD OF THE INVENTION

This invention relates to a rotary brush for surface treatment ofworkpieces and more particularly to such a brush including a fitting orclamping joint between a pair of axial collars, at least one of whichhas axial ribs on its circumference.

BACKGROUND ART

Known rotating circular brushes are usually produced by disposing thebrush fitting, which includes for example one or more disk-like brushelements, between a plurality of pressed metal parts. This constructionhas hitherto been used by all brush manufacturers and is still appliedtoday in a great number of similar forms.

In contrast, DE-U 295 13247.7 discloses a rotary brush of the generickind wherein the brush fitting is clamped between two interconnectedclamping disks and thereby mounted on an essentially cylindrical holdingelement formed by said clamping disks.

Although this known rotary brush has proven very advantageous, it hasturned out that there is still a need for simplified production of thebrush and an essential reduction of material costs.

The invention is therefore based on the problem of designing the brushof the generic kind so as to simplify production while achieving aconsiderable reduction of material costs and simultaneously a lowerweight involving further handling advantages.

The features of the invention solving this problem can be found inclaim 1. Advantageous embodiments are described in the further claims.

SUMMARY OF THE INVENTION

The inventive rotary brush is designed such that the clamping disks eachhave on their mutually facing side an axial collar whose outside orinside diameter is such that when the clamping disks are fastenedtogether the axial collar of one clamping disk engages that of the otherclamping disk in connecting fashion so as to form the clamping diskconnection and this simultaneously forms the cylindrical holding elementfor mounting the brush fitting.

This design is based on the essential inventive idea of not providingthe axial collars of the two clamping disks only for mounting the brushfitting, but designing them so that they fix the two clamping diskstogether themselves. This can be easily obtained with simple productiontechniques so as to ensure a simple and reliable connection of theclamping disks.

In one embodiment of the invention, the axial collars of the twoclamping disks have the same length, while in a second embodiment thecollars have different lengths.

The engaging connection between the axial collars of the two clampingdisks includes a fitting or clamping joint. The fitting or clampingjoint between the axial collars is formed by at Least one of the collarshaving elevations, in particular in the form of axial ribs, on itscircumferential surface cooperating with the other collar.

When the two clamping disks are pressed together, which is done using a20 ton press for example, these elevations are connected effectivelywith the associated circumferential surface of the other collar by theaction of force, thereby achieving the desired reliable connectionbetween the clamping disks. In one embodiment, the engaging connectionbetween the axial collars of the two clamping disks is formed or securedby adhesive applied to at least one of the cooperating circumferentialsurfaces of the axial collars.

In an expedient embodiment of the inventive rotary brush, the axial ribsare provided on the outside circumferential surface of thesmaller-diameter axial collar. Two axial ribs are advantageously presentin each case. However, it is within the scope of the invention toprovide three, four or more axial ribs instead.

It is advantageous for the axial ribs to be spaced the samecircumferential distance apart, since this also achieves a uniformclamping effect over the circumference of the axial collars.

In order to facilitate the joining of the two clamping disks by theaction of high force in the initial stage, the axial ribs are preferablybeveled on their front free faces.

Accordingly, it is also within the scope of the invention for the axialcollar receiving the axial ribs to be beveled on its front face.

Unless the two clamping disks are intended to be detached from eachother at a later time for some reason, an advantageous embodiment of theinvention is for the axial collar receiving the axial ribs to bear atits front end a torus which grasps behind the axial ribs formed withpredetermined length of the other axial collar in securing fashion whenthe clamping disks are fixed together.

To mount the brush fitting in nonslip fashion on the cylindrical holdingelement formed by the two clamping disks, the greater-diameter axialcollar expediently bears axially extending longitudinal ribs on itsoutside circumferential surface.

It is advantageous for the clamping disks to be made of glass fiberreinforced plastic. It is thereby within the scope of the invention forthe clamping disks to be injection molded parts.

Altogether the inventive rotary brush can achieve essential advantages,including:

less labor for producing the brush,

considerable reduction of material costs,

simpler mounting equipment,

improved possibility of assembling the brush,

lower weight,

better suitability for automatic production, etc.

The invention will be explained more closely in the following withreference to the drawings.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 cross sectional view of one clamping disk of the inventive rotarybrush,

FIG. 2 is a cross sectional view of the other clamping disk of therotary brush,

FIG. 3 is a cross sectional view of the rotary brush with the twoclamping disks in the fixed state; and

FIG. 4 is a modification of the disk of FIG. 1 wherein the axial collarhas the same length as the axial collar of FIG. 2.

DETAILED DESCRIPTION OF THE DRAWING

As evident from the drawing, in particular FIGS. 1 and 2, the rotarybrush provided for surface treatment of workpieces has two clampingdisks 1, 2 which are designed differently in the shown embodiment butcan also have the same design.

As indicated clearly by FIGS. 1 and 2, clamping disks 1, 2 each have ontheir mutually facing side axial collars 3, 4. Its outside or insidediameter is such that when clamping disks 1, 2 are fastened togetheraccording to FIG. 3 axial collar 3 of clamping disk 1 engages axialcollar 4 of clamping disk 2 in connecting fashion so as to form theclamping disk connection. This simultaneously forms a cylindricalholding element for mounting brush fitting 5 (see FIG. 3). This fittingis designed in the usual way with wire bristles 7 held in clampingelements 6 of U-shaped cross section.

As indicated in detail by FIGS. 1 and in one embodiment the design issuch that axial collar 3 of clamping disk 1 has a greater length thanaxial collar 4 of clamping disk 2 and its diameter is smaller, i.e. itreaches on its outside circumferential surface at most the diameter ofthe inside circumferential surface of axial collar 4 of clamping disk 2.In the embodiment of FIG. 4, the axial collar 3 of clamping disk 1 isthe same length as the length of the axial collar 4 of clamping disk 2of FIG. 2.

In the shown embodiment, the engaging connection between axial collars3, 4 of clamping disks 1, 2 is obtained by a fitting or clamping jointin that smaller-diameter axial collar 3 of clamping disk 1 has on itsoutside circumferential surface a plurality of axial ribs 8--in theshown embodiment two axial ribs 8--spaced the same circumferentialdistance apart. The presence of axial ribs 8 thus produces the effectthat axial collar 3 of clamping disk 1 has on its outsidecircumferential surface altogether a greater diameter than axial collar4 of other clamping disk 2 on its inside circumferential surface. Onethus obtains an effective fitting or clamping joint when clamping disks1, 2 are joined and fastened together by collar 3 being pressed intocollar 4.

In order to facilitate this pressing, axial ribs 8 are beveled on theirfront free face 9.

For the same purpose, axial collar 4 of other clamping disk 2 receivingaxial ribs 8 of axial collar 3 is also beveled on its front face 10.

To secure the good fitting or clamping joint obtained when clampingdisks 1, 2 are fixed together, greater-diameter axial collar 4 has atits front end torus 11 which grasps behind axial ribs 8 of axial collar3 in securing fashion when clamping disks 1, 2 are fixed together. Forthis purpose axial ribs 8 in the embodiment of FIG. 1 are formed with anaccordingly great predetermined length so as to secure the back-graspingfunction. This is especially clear from FIG. 3.

For nonslip mounting of brush fitting 5, greater-diameter axial collar 4of clamping disk 2 bears on its outside circumference axially extendinglongitudinal ribs 12. For example, eight longitudinal ribs 12 are spacedthe same circumferential distance apart, which ensures reliable andnonslip mounting of the brush fitting.

The same purpose is served by point-shaped projections 13 disposednumerously on the mutually facing inside surfaces of clamping disks 1,2.

Clamping disks 1, 2 are made of glass fiber reinforced plastic and canadvantageously be shaped as injection molded parts.

As is also clear from FIG. 3, clamping disks 1, 2 bear on their outsidesurface predetermined depressions 14 which are intended as labeling andmarking surfaces.

Although the described embodiment is fundamentally conceived as anundetachable connection of clamping disks 1, 2 it is of course alsopossible, if desired, to design the connection between clamping disks 1,2 so as to be subsequently detached, for example using a suitable toolfor undoing the described securing of the connection.

With respect to features of the invention not specified above, referenceis expressly made to the claims and drawing.

What is claimed is:
 1. A rotary brush for surface treatment of workpiece comprising a brush fitting clamped between two interconnected clamping disks and mounted on an essentially cylindrical holding element formed thereby, the two clamping disks each having on their mutually facing sides an axial collar having outside or inside diameter such that when the clamping disks are fastened together the axial collar of one clamping disk engages the axial collar of the other clamping disk in connecting fashion so as to form the clamping disk connection to simultaneously form the cylindrical holding element for mounting the brush fitting, the engaging connection between the axial collars of the two clamping disks being formed by a fitting or clamping joint, the fitting or clamping joint between the axial collars being formed by at least one of the axial collars having elevations, in the form of axial ribs on its circumferential surface cooperating with the axial collar.
 2. The brush of claim 1, wherein the axial collars of the two clamping disks have the same length.
 3. The brush of claim 1, wherein the axial collars of the two clamping disks have different lengths.
 4. The brush of claim 1, wherein the engaging connection between the axial collars of the two clamping disks is a detachable connection.
 5. The brush of claim 1, wherein the engaging correction between the axial collars of the two clamping disks is formed or secured by adhesive applied to at least one of the cooperating circumferential surfaces of the axial collars.
 6. The brush of claim 1, wherein one of the axial collars has a small diameter than another axial collar and the axial ribs are on the outside circumferential surface of the smaller-diameter axial collar.
 7. The brush of claim 1, wherein at least two axial ribs are provided.
 8. The brush of claim 1, wherein the axial ribs are spaced the same circumferential distance apart.
 9. The brush of claim 1, wherein the axial ribs are beveled on front free faces thereof.
 10. The brush of claim 1, wherein the axial collar receiving the axial ribs of the other axial collar is beveled on a front face thereof.
 11. The brush of claim 1, wherein the axial collar receiving the axial ribs bears at its front end a torus which grasps behind the axial ribs with predetermined length of the other axial collar in securing fashion when the clamping disks are fixed together.
 12. The brush of claim 1, wherein one of the greater-diameter axial collar bears on its outside circumferential surface axially extending longitudinal ribs for nonslip mounting of the brush fitting.
 13. The brush of claim 1, wherein the clamping disks are made of glass fiber reinforced plastic.
 14. The brush of claim 1, wherein the clamping disks are injection molded parts. 